Valve confirms indications from earlier this week that the downtime on the Steam Users' Forums was the result of a break-in, revealing that the Steam service itself also suffered an intrusion. Here is a message from Valve's Gabe Newell explaining the situation:

Dear Steam Users and Steam Forum Users,

Our Steam forums were defaced on the evening of Sunday, November 6. We began investigating and found that the intrusion goes beyond the Steam forums.

We learned that intruders obtained access to a Steam database in addition to the forums. This database contained information including user names, hashed and salted passwords, game purchases, email addresses, billing addresses and encrypted credit card information. We do not have evidence that encrypted credit card numbers or personally identifying information were taken by the intruders, or that the protection on credit card numbers or passwords was cracked. We are still investigating.

We don't have evidence of credit card misuse at this time. Nonetheless you should watch your credit card activity and statements closely.

While we only know of a few forum accounts that have been compromised, all forum users will be required to change their passwords the next time they login. If you have used your Steam forum password on other accounts you should change those passwords as well.

We do not know of any compromised Steam accounts, so we are not planning to force a change of Steam account passwords (which are separate from forum passwords). However, it wouldn't be a bad idea to change that as well, especially if it is the same as your Steam forum account password.

We will reopen the forums as soon as we can.

I am truly sorry this happened, and I apologize for the inconvenience.

There is no hypocrisy. Sony took forever to respond, then took their servers offline for months, and had to rebuild their entire infrastructure.

Sony was fucking incompetent as hell throughout the whole thing.

No one is invulnerable to hacks. The important thing is how well-secured the data that was stolen is, and how they respond to it. Sony had jack shit security on the stored data - they didn't even fucking salt the passwords, one of the most elementary lessons in security.